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U.S. Geological Survey (USGS) · Public domain
Landmark Americas wonder

Great Blue Hole

3000 BCE – still standing

Giant marine sinkhole off the coast of Belize, a near-perfect circle of deep blue surrounded by reef

Wikipedia

The opening of the article, and a way into the rest of it without leaving the site.

Great Blue Hole on Wikipedia.

Elsewhere in Americas at the time

Records whose own span overlaps this one, found by the same test the canvas draws with. The bar under each card is where it sits inside this one.

See the whole view
Image credits5 pictures from Wikimedia Commons
  • Great Blue HoleU.S. Geological Survey (USGS) · Public domain
  • Chichen ItzaDaniel Schwen · CC BY-SA 4.0
  • Flag of Canada (Pantone)Original: George F. G. Stanley Modified by: The original uploader was Illegitimate Barris… · Public domain
  • Machu PicchuDraceane · CC BY-SA 4.0
  • Flag of MexicoOmar Alejandro Covarrubias Neri, 9 April 2006. Based on the 1968 arms by Francisco Eppens… · Public domain